怀特海的哲学中的主要矛盾表现在哪些方面？

2013年3月发生的人体感染的H7N9禽流感病毒，是全球首次发现的新亚型流感病毒，以往仅在禽间发现．病毒传播途径目前还未知，根据目前的观察结果为提示有较强的人际传播能力，国内外还尚无针对疫苗．各地已积极采取措施，关闭活禽交易市场．专家指出，目前对于该病的预防措施有：a远离家禽的分泌物，接触过禽鸟或禽鸟粪便要用消毒液和清水清洁双手．b食用鸡蛋时蛋壳应用流水清洗；不吃生的或半生的鸡蛋，烹调加热充分．c吃禽肉要煮熟，煮透．d勤洗手，咳嗽和打喷嚏时遮掩口鼻．e加强体育锻炼，增强抵抗力．根据上述资料回答：

（1）H7N9禽流感可以在禽间流传，据此可判断这是一种______病，引起H7N9禽流感的H7N9禽流感病毒是该病的______．

（2）H7N9禽流感病毒没有在细胞结构中，但仍是一种生物，请写出至少一条能证明属于生物的特征：______

（3）H7N9禽流感的寄生主是禽鸟或人，据此可以判断它属于______病毒．

（4）从预防传染病的角度分析，“关闭活禽交易市场”属于______，e措施则属于______．

柱塞泵在吸入过程中，应使液缸内的最小吸入压力始终（）液体在同温度下的汽化压力。

A、大于

B、等于

C、小于

D、约等于

什么叫做表观气速？

喂丝机振盘内供丝流量不均匀时，要检查吸风管风量（）系统是否有故障，排除故障。

A transport layer protocol usually has several responsibilties. One is to create a process-to-process communication UDP uses （1）numbers to accomplish this. Another responsibility is to provide control mechanisms at the transport level UDP does this task at a very minimal level. There is no flow control mechanism and there is no （2）for received packet. UDP, however, does provide error control to some extent. If UDP detects an error in the received packet, it will silently drop it.

The transport layer also provides a connection mechanism for the processes. The （3）must be able to send streams of data to the transport layer. It is the responsibility of the transport layer at（4）station to make the connection with the receiver chop the stream into transportable units, number them, and send them one by one. it is the responsibility of the transport layer at the receiving end to wait until all the different units belonging to the same process have arrived, check and pass those that are （5） free, and deliver them to the receiving process as a stream.

（1）是（）

A.hop

B.port

C.route

D.packet